On occasions, and usually lasting for a short period of a couple of days, you may encounter messages that you sent to recipients with BT email addresses being rejected or marked as spam, even though they were clearly genuine and legitimate.
​

In a nutshell, this is nothing to worry about and it is the cause of the BT spam filter being quite temperamental at times. The company appears to randomly adjust their spam filters which can result in short-lived delivery issues which tend to clear up after a few days.

You may be wondering why your personal email address can reach them, when membermeister doesn't?

Private email addresses send far fewer messages than corporate email systems that send out thousands of emails per day, as with membermeister. As a result, these private email addresses rarely show up on the radar of email provider spam filters, unless there's a huge security issue. If not calibrated correctly, when the receiving mail server receives large volumes of emails from the same outgoing email provider, like the provider membermeister uses, these emails can trigger a spam filter adjustment at the receiving end. The spam filter eventually catches on that these are legitimate emails, but it takes a few days.

The last time we saw this issue occur resulted in roughly 100 messages out of a total of 12,000 being rejected and those were spread over a handful of membermeister customers. However even 100 messages out of 12,000 is still a lot more than usual.

The messaging system at membermeister protects itself by stopping to send messages to addresses that have previously bounced a message back or reported a message as spam. You may have noticed that this doesn't happen with BT addresses. This is because we auto-whitelist BT addresses when they bounce, as the fault clears so quickly, and always does clear eventually.

As a way of helping the BT spam filter to train itself, we advise that you ask your customers with a BT address to add [email protected] to their safe-sender list. We've had huge success doing this with other providers, but BT seems harder to train. Here is an article that explains how to do this.

We really do appreciate how frustrating this is, and we're always looking at new ways to tackle the problem. Should you have any questions or concerns, please contact [email protected] and one of the team will be happy to help.